rigorous /ˈrɪgərəs/ adjective Learner's definition of RIGOROUS
[more rigorous; most rigorous]
1
: very strict and demanding严格的；严厉的 2
: done carefully and with a lot of attention to detail缜密的；细致的 3
: difficult to endure because of extreme conditions严酷的；恶劣的
— rigorousness
noun [noncount]